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In what scenarios will you use a abstract class and in what scenarios will you use a interface?

Abstract class scenarios When we need to create the common functionality and  behavior  of method. The  behavior  of the method are not changed. In this scenarios, we will use a abstract  class. For example, We are working on order place here some functionality and  behavior  are same like create order id and place order details in database etc. here we will use abstract class. Interface scenarios When we need common functionality but  behavior  may change and we need to follow the functionality strictly then we have to use interface suppose. For example, Suppose we have to place acknowledge to suppliers about order and it's take as a file format some supplier taking format as csv, some xml etc. In this scenarios, we will use a Interface because functionality is same but  behavior  are changes but strictly we have to follow acknowledge for supplier.
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